Add timeouts to cloudbuild.yaml

Bug: skia:
Change-Id: Ibe95223343bbb9980bca84c336ac3ef162a13c2a
Reviewed-on: https://skia-review.googlesource.com/139164
Auto-Submit: Joe Gregorio <jcgregorio@google.com>
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Joe Gregorio <jcgregorio@google.com>
1 file changed